AU2015218435B2 - Agricultural machine with at least one articulated seeder bar - Google Patents

Abstract

The present invention relates to an agricultural machine (1) having a trailed chassis (2) and a transverse bar (3) in several portions extending substantially transversely to the direction of advance (A) in the work position and extending substantially parallel to the direction of advance (A) in the transport position, the transverse bar includes two portions (3A, 3B) able to be folded around a first respective articulation (8) with a substantially vertical axis, each portion (3A, 3B) supports a seeder device (10) made up of ahopper(11)and aseederbar(12). The agricultural machine is remarkable in that each seeder bar (12) is fixed on the corresponding portion (3A, 3B) using a second articulation (15) with a substantially horizontal axis oriented parallel to the direction of advance (A) in the work position. 24t/nR/15 7300nR -ni 17 co CO co

Description

AGRICULTURAL MACHINE WITH AT LEAST ONE ARTICULATED SEEDER BAR FIELD OF THE INVENTION [0001] The present invention relates to the general technical field of agricultural machinery. The invention relates to an agricultural machine having a trailed chassis and a transverse bar in several portions extending substantially transversely to the direction of advance in the work position and extending substantially parallel to the direction of advance in the transport position, the transverse bar includes two portions able to be folded around a first respective articulation with a substantially vertical axis, each portion supports a seeder device made up of a hopper and a seeder bar.

BACKGROUND OF THE INVENTION [0002] Document FR 2,871,988 Al describes such an agricultural machine with two parts that can be folded toward the front. This known agricultural machine is a tool-carrier that makes it possible to combine agricultural devices, such as seeders, to work over a greater working width. Each seeder is mounted on the transverse bar using a conventional three-point hitch. This conventional three-point hitch makes it possible to raise and lower the seeder. The use of such three-point hitches increases the width of the agricultural machine in the transport configuration, since each portion is folded toward the front. Taking the position of the wheels of the carriage into account, the seeders must be raised above the wheels. The stability of the agricultural machine during transport is therefore reduced, since the center of gravity is far from the ground. The instability is accentuated when the hoppers are full.

[0003] On other known wide agricultural machines, a device is provided to allow long transport. The transport direction is then perpendicular to the work direction. Such a device requires, in most cases, unhitching the tractor and hitching

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2015218435 25 Aug 2015 it in the other position to be able to transport the wide agricultural machine on roads.

[0004] The present invention aims to overcome the aforementioned drawbacks and seeks to propose a simpler wide agricultural machine with good terrain following and a reduced bulk during transport.

[0005] According to the invention, there is provided Agricultural machine having a trailed chassis and a transverse bar in several portions extending substantially transversely to the direction of advance in the work position and extending substantially parallel to the direction of advance in the transport position, the transverse bar includes two portions able to be folded around a first respective articulation with a substantially vertical axis, each portion supports a seeder device made up of a hopper and a seeder bar, each seeder bar being fixed on the corresponding section using a second articulation with a substantially horizontal axis oriented parallel to the direction of advance in the work position, only the seeder bar is movable relative to the corresponding section around the second articulation. The seeder bar can follow the terrain independently of the corresponding portion and the trailed chassis.

[0006] According to another feature of the invention, when at least one of the portions is positioned parallel to the direction of advance in the transport configuration, the corresponding seeder bar extends substantially parallel to the surface of the ground. In this way, the ground clearance of the agricultural machine is increased without modifying the height position of the center of gravity.

[0007] According to one feature of the invention, the second articulation is laterally offset relative to the position of the center of gravity of the seeder bar. Thus, the seeder bar is automatically aligned with the ground during transport and at least one of the ends of the seeder bar is freed from the ground to avoid contact with the ground during half-turn maneuvers at the end of the field.

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2015218435 25 Aug 2015 [0008] Other features and advantages of the invention will emerge from the following description in light of the appended drawings, which are provided solely as non-limiting examples of the invention. In these drawings:

- figure 1 is a top view of an agricultural machine according to the invention, in a work configuration,

- figure 2 is a front view of the agricultural machine during work,

- figure 3 is a side view of the agricultural machine during transport.

[0009] The agricultural machine (1) according to the invention includes a trailed chassis (2) and a transverse bar (3) in several portions to be able to intervene over a wide work strip. As shown in figure 1, the transverse bar (3) has two portions (3 A, 3B). The chassis (2) is made in the form of a longitudinal frame (4) equipped in the front with a hitching device (5) and in the rear with a carriage (6). The hitching device (5) is intended to be hitched to the hitch of a tractor (not shown). The tractor is made to move and drive the agricultural machine (1) in a direction of advance indicated by the arrow (A). The invention thus relates to a trailed agricultural machine whereof the chassis (2) rests on the ground via the wheels (7) of the carriage (6). Figure 1 shows the agricultural machine in its work configuration. One portion extends to the right and the other to the left of the longitudinal frame (4). The two portions (3 A, 3B) extend substantially transversely to the direction of advance (A) in a work configuration. They extend in the extension of one another and are substantially aligned in light of the direction of advance (A). To reduce the width of this agricultural machine (1) during transport, the two portions (3 A, 3B) are folded to extend substantially parallel to the direction of advance (A). In this folded position, the width of the agricultural machine (1) is considerably reduced, since each portion (3 A, 3B) is positioned substantially parallel to the longitudinal frame (4). In the example embodiment, the portions (3A, 3B) can be folded by pivoting around a first articulation (8) with a substantially vertical axis. The pivoting of the portions (3 A, 3B) is controlled by double-acting jacks. The wheels (7) of the carriage (6) extend behind the portions (3 A, 3B), and

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2015218435 25 Aug 2015 the portions (3 A, 3B) advantageously pivot forward. In one alternative, the portions (3 A, 3B) are folded toward the rear, when the wheels (7) are positioned in front of the portions (3A, 3B).

[0010] In order to adapt to the different work to be done, the height of the chassis (2) is adjustable relative to the carriage (6) using at least one actuator (9). In the illustrated example, the actuator (9) is made in the form of a jack, made up of a cylinder and a piston, which moves in one direction or the other under the action of a fluid. The actuator (9) is preferably a jack of the double-acting type. Advantageously, two actuators (9) extend between the carriage (6) and the chassis (2). These actuators (9) serve to raise or lower the chassis (2) of the agricultural machine (1).

[0011] Figure 2 shows a front view of the agricultural machine (1) in a work position. Each portion (3 A, 3B) supports a seeder device (10) made up of a hopper (11) and a seeder bar (12). The agricultural machine (1) is therefore intended to sow seeds or other products. The hopper (11) makes up the seed reserve. In the lower part of the hopper (11), there is at least one distribution arrangement, the function of which is to remove a predetermined quantity of seeds. The distribution flow rate is adapted based on the speed of advance of the agricultural machine (1). A gearbox makes it possible to vary the distribution speed to adapt to the species to be seeded and the quantity of seeds per hectare. The seeder bar (12) groups together the burying elements (13), which form furrows at a predetermined depth to place the seeds therein. The work depth of the seeder bar (12) is adjusted using the actuators (9). The desired adjustment is guaranteed owing to wedges mounted on the rod of each actuator (9). Pipes (14) connect the burying elements (13) to the distribution arrangement to convey the seeds toward the ground. The pipes (14) therefore extend between the hopper (11) and the seeder bar (12). Only some of the pipes (14) are shown in the figures.

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2015218435 25 Aug 2015 [0012] According to one important feature of the invention, each seeder bar (12) is fixed on the corresponding portion (3A, 3B) using a second articulation (15) with a substantially horizontal axis oriented parallel to the direction of advance (A) in the work position. In this way, the seeder bar (12) can follow the terrain independently of the corresponding portion (3 A, 3B) and the chassis (2). The seeder bar (12) is independent relative to the transverse bar (3) of the agricultural machine (1). Particularly advantageously, the hoppers (11) are rigidly fastened to the transverse bar (3). Each hopper (11) is mounted fixed on the corresponding portion (3 A, 3B), the entire weight of the hopper (11) therefore being supported by the corresponding portion (3 A, 3B). The second articulation (15) does not support the weight of the corresponding hopper (11), thus its dimensioning will be smaller. It will also be noted that the portions (3 A, 3B) have no ground bearing wheels and that the transverse bar (3) does not include an articulation with a horizontal axis oriented in the direction of advance (A) during the work. The seeder bar (12) follows the terrain owing solely to the second articulation (15). According to figure 2, the second articulation (15) is produced directly in the corresponding portion (3 A, 3B). The articulation is relatively easy to produce, since the portion (3 A, 3B) is a beam, for example hollow, with a square transverse section. In one alternative, the second articulation (15) is positioned below the corresponding portion (3A, 3B). In another alternative, the second articulation (15) is positioned on the corresponding portion (3 A, 3B).

[0013] According to another feature, when at least one of the portions (3 A,

3B) is placed in the transport configuration, the corresponding seeder bar (12) extends substantially parallel to the surface of the ground. Thus, the ground clearance of the seeder bar (12) is substantially identical at both of its ends. Figure 3 shows the agricultural machine (1) in side view in the transport configuration. The second articulation (15) is advantageously placed in the vicinity of the center of gravity of the seeder bar (12). The second articulation (15) is therefore remote from the median vertical plane (16). Such a position of the second articulation (15) makes

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2015218435 25 Aug 2015 it possible to have a more or less balanced seeder bar (12). Because it involves a seeder device (10), it is necessary for the seeding depth to be respected and to be constant on either side of the seeder bar (12). Generally, the burying elements (13) rest on the ground with a predetermined pressure or must work the ground at a given depth to ensure good germination of the seeds and homogenous plant growth. Owing to this second articulation (15), the seeder bar (12) is kept substantially parallel to the surface of the ground. Thus, the ground clearance of the seeder bar (12) is substantially identical for each of the ends of the seeder bar (12). This is an advantage during transport and during half-turn maneuvers at the end of the field by the agricultural machine (1). Advantageously, the seeder bar (12) pivots freely around the second articulation (15). The pivoting is free in the work position and the transport position. Since the seeder bar (12) pivots around the second articulation (15), the seeder bar (12) is able to move more or less away from the hopper (11) at its ends. Thus, the pipes (14) connecting the distribution arrangement to the burying elements (13) must be able to absorb the length difference. The pipes (14) are therefore configured to absorb the different positions of the seeder bar (12) during the work, and in particular length variations. In the example embodiment, the pipes (14) are telescopic. In another alternative, the pipes (14) are flexible.

[0014] According to another important feature of the invention, the second articulation (15) is laterally offset relative to the position of the center of gravity of the seeder bar (12). Owing to the off-centered position of the second articulation (15) relative to the seeder bar (12), the seeder bar (12) automatically aligns to the surface of the ground when the portions (3 A, 3B) are folded for transport. Particularly advantageously, the second articulation (15) extends between the vertical plane (17) passing through the center of gravity of the seeder bar (12) and the outer end of the seeder bar (12). With this lateral shift of the second articulation (15) in the outer half of the seeder bar (12), the outer end of the seeder bar (12) is automatically raised for the half-turn maneuvers at the end of the field. This thereby prevents the outer ends from coming into contact with the ground when the chassis

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2015218435 25 Aug 2015 (2) of the agricultural machine (1) moves. In the example embodiment shown in the figures, the second articulation (15) is produced directly in the corresponding portion (3 A, 3B). One can also see that the agricultural machine (1) is symmetrical relative to the median vertical plane (16). In an alternative that is not shown, the second articulation (15) extends between the median vertical plane (16) of the agricultural machine (1) and the vertical plane (17) passing through the center of gravity of the seeder bar (12). This lateral shift of the second articulation (15) in the inner half of the seeder bar (12) makes it possible to raise the inner end of the seeder bar (12) automatically.

[0015] Figure 3 shows the wide agricultural machine (1) in the transport position, and in particular the right portion (3B) of the transverse bar (3). The seeder bar (12) of this portion (3B) has a considerable working width, exceeding three meters. It will be noted that the width of the seeder bar (12) is greater than that of the hopper (11). To further improve the adaptation to the terrain and following of the ground, the seeder bar (12) is divided into at least two sections (12A, 12B, 12C). Each section (12A, 12B, 12C) is mounted using a respective jack (20). This is a hydraulic jack. The jack (20) is combined with a hydropneumatic device with adjustable pressure. Adjusting this pressure makes it possible to modify the depth control force of the burying elements (13). This hydropneumatic device on the one hand makes it possible for the corresponding section (12A, 12B, 12C) to adapt more precisely to the ground and on the other hand allows the section (12A, 12B, 12C) to clear the ground when it encounters an obstacle on the ground. Such an assembly by sections (12A, 12B, 12C) contributes to quality seeding with a respected depth. In the illustrated example, the seeder bar (12) includes three independent sections (12A, 12B, 12C) and three jacks (20).

[0016] The agricultural machine (1) according to the invention is able of simultaneously sowing fertilizer and seeds. To that end, each hopper (11) is divided into two distinct reservoirs. The reservoirs are separated by a wall. The position of the wall is advantageously adjustable in the hopper (11). Each reservoir is provided

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2015218435 25 Aug 2015 with a respective distribution arrangement (18, 19). These distribution arrangements (18, 19) are advantageously superimposed, and are shown diagrammatically in figure 3. The distribution arrangement for fertilizer (18) extends substantially above the distribution arrangement for seeds (19). At the outlet of the distribution arrangement, the fertilizer and seeds are oriented toward the ground through a same pipe. The illustrated agricultural machine (1) is a seeder with a double distribution arrangement. According to the figures, the seeder device (10) is a seeder with mechanical distribution. Generally, the width of the hopper (11) for a mechanical seeder is substantially equal to the seeding width. In the agricultural machine (1) according to the invention, one can see that the width of the seeder bar (12) is greater than the width of the corresponding hopper (11). Burying members (13) thus extend below the chassis (2) to seed in the central zone of the agricultural machine (I) . Advantageously, at least two burying elements (13) are positioned between the vertical planes passing through the first articulations (8). At the outer ends of the seeder bar (12), at least two burying elements (13) are positioned beyond the hopper (II) . The respective distribution arrangements supplying these additional burying members are mounted and housed in the widthwise bulk of the hopper (11). The width of each distribution arrangement is compact, which makes it possible to add at least two distribution arrangements to supply the burying elements (13) that are added on at least one side of the hopper (11). In figure 1, three burying elements (13) extend beyond the width of the hopper (11) at the outer ends of the seeder bar (12) and two burying elements (13) extend beyond the width of the hopper (11) at the inner ends of the seeder bar (12).

[0017] According to an alternative that is not shown, the seeder device (10) is a pneumatic distribution seeder. The distribution is then done by at least one seed metering device, and each metering device then supplies one or more rows using delivery chutes. The distribution width is much smaller than the width of the hopper (11)·

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2015218435 25 Aug 2015 [0018] According to figure 3, it will be noted that the hopper (11) is tilted forward. The vertical axis of the corresponding first articulation (8) is oriented forward. This tilt takes place because the chassis (2) is raised via the actuators (9) and the hitching device (5) is closer to the ground. The height of the hitching device (5) relative to the ground results from the tractor used and the height adjustment of the lifting system. According to the illustrated embodiment, the two portions (3 A, 3B) pivot around the first articulation (8) toward the front to arrive in the transport position.

[0019] The invention is of course not limited to the embodiments described above and shown in the appended drawings. Modifications remain possible, in particular regarding the composition or number of the various elements or by substituting technical equivalents, without, however, going beyond the scope of protection as defined by the following claims.

[0020] Throughout this specification and the claims which follow, unless the context requires otherwise, the word comprise, and variations such as comprises and comprising, will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

[0021] The reference to any prior art in this specification is not and should not be taken as an acknowledgement or any form of suggestion that the prior art forms part of the common general knowledge in Australia.

Claims (11)

1. An agricultural machine comprising:

a trailed chassis; and a transverse bar extending substantially transversely to a direction of advance in a work position and extending substantially parallel to the direction of advance in a transport position, the transverse bar includes two portions able to be folded around a first respective articulation with a substantially vertical axis, each portion of the transverse bar supports a seeder device made up of a hopper and a seeder bar, wherein each seeder bar is fixed on a corresponding portion of the transverse bar using a second articulation with a substantially horizontal axis oriented parallel to the direction of advance in the work position, and only the seeder bar is movable relative to the corresponding portion of the transverse bar around the second articulation.

2. The agricultural machine according to claim 1, wherein when at least one of the portions of the transverse bar is placed in the transport position, a corresponding seeder bar on the portion of the transverse bar placed in the transport position extends substantially parallel to a surface of a ground.

3. The agricultural machine according to claim 1, wherein pivoting around the second articulation is free in the work position and the transport position.

4. The agricultural machine according to claim 1, wherein the second articulation is laterally offset relative to a position of a center of gravity of the seeder bar.

5. The agricultural machine according to claim 1, wherein the second articulation extends between a vertical plane passing through a center of gravity of the seeder bar and an outer end of the seeder bar.

6. The agricultural machine according to claim 1, wherein the second articulation is produced directly in the corresponding portion of the transverse bar.

7.

The agricultural machine according to claim 1, wherein the hopper is mounted fixed

2015218435 07 Feb 2019 on the corresponding portion of the transverse bar.

8. The agricultural machine according to claim 1, wherein the portions of the transverse bar are free of bearing wheels.

9. The agricultural machine according to claim 1, wherein at least one of the seeder bars is divided into at least two sections, each section of the at least one of the seeder bars is mounted to the corresponding portion of the transverse bar using a jack.

10. The agricultural machine according to claim 1, wherein the two portions of the transverse bar pivot around the first respective articulation toward a front of the agricultural machine to arrive in the transport position.

11. The agricultural machine according to claim 1, wherein the seeder device is a seeder with mechanical distribution or a seeder with pneumatic distribution.